That's not how that works. Asexual people don't feel sexually attracted to anyone. The urges in general can still be there and people who lack the urges might still be sexually attracted to somebody, it's not necessarily a package deal where you throw out one and the other is gone too. Many if not most asexual people probably still masturbate, because unless they also have little to no sex drive, they're gonna want that release from time to time like anybody else. Since they're not sexually attracted to others, they might lean towards playing solo more than average.Betting my money that Glasses girl is asexual